I’m curious about the two breather outlets that face rearwards on the cam cover on my K. It’s a scholar Evo 2 (not that it’s particular relevant) which of course has a std cam cover that you’d find on a VHPD. One of these breathers I have connected to an alloy catch tank - the other is just vented to atmosphere. I recall my old Exige had these breathers connected via a T-piece into the airbox. My question is - why into the airbox; the idea of providing a breather and thus a potential oil outlet into the airbox doesn’t make sense. This is after the afterfilter and surely you want it as clean as a whistle in there?
Closed circuit breathing system - You were saving the world before now you are causing ozone layer depletion and global warming with your open breather system
Into the airbox to burn the oil fumes.
But this degrades octane number, so in racing, it’s vented ot the atmospherre.
Buat as the name says, oil catch tank, is not only for venting, it’s there since if you have a problem, let’s say broken rings and the sudden increase in cranckase pressure pushes the oil up the vent holes, there’s somewhere to catch it. Before, being in the airbox, it would be recycled and sudden clouds of smoke (burnt oil) would warn you, well, others
So both holes need to go into the catch tank. Recommend a T piece or another hose if there is another prong in the tank.
The two spouts are for positive crankcase ventilation, the one connected to the airbox would normally be to bring filtered air into the engine with the other breathing air and crankcase fumes directly into the inlet manifold via the IACV plumbing, from here it is imbibed into the engine where it is consumed. In small quantity this has little effect, however when RPM is high oil content can rise and as Uldis says the oil content can reduce the overall Octane rating of the fuel and can cause detonation. If you are scrapping PCV then vent the larger outlet into a catchtank and either seal the smaller one or vent it to the same place. Ideally the tank needs to provide for the fumes to dump their oil and water content at the bottom before venting the air out of the top. One way to achive this is to have a layer of foam around 1/3rd of the way down the tank and vent to the area below, air will then escape upwards thru the foam and will lose its liquid content. Ideally the outlet from the tank should be then vented down and below the car to keep the engine bay clean.
Dave
I have done a similar thing on my old elan with some packing foam, 1/2 petrol pipe and a sharwoods curry powder container with a hole for the pipe cut in the screw cap.
The pipe vents below the foam and the gasses just vent out through the gap between the lid and the pipe.
Bluepeterpikeytastic
I should say the Exige deserves something in anodised alloy
Demon Theives do them starting at �60 ish
Simon
Hmmm, that looks familiar Uldis - I have two:
http://www.bookatrack.com/-PG?eliotc&2835&24061&640
the other for the gearbox, though I suppose thy could use the same one. Thanks for all the tips guys. Simon, I can’t believe you’re using a curry jar as a catch tank - you bodger!!??
Closed circuit breathing system - You were saving the world before now you are causing ozone layer depletion and global warming with your open breather system
I don’t think I was quite saving the planet in the Exige, it was a 190 with a v. loud Janspeed and no cat - it would have been way off the scale in an emissions test. Trees used to keel over in its wake, children would become deaf asthmatics
Hmmm, that looks familiar Uldis - I have two:
http://www.bookatrack.com/-PG?eliotc&2835&24061&640
the other for the gearbox, though I suppose thy could use the same one. Thanks for all the tips guys. Simon, I can’t believe you’re using a curry jar as a catch tank - you bodger!!??
Yeah I use the same tank for both the engine and the gearbox, although neither breath anything.
What’s with that naked fuel pressure sensor in that picture - cover those electrical leads with one of those rubber-heat-shrink thingys from IS Motorsport…
I had been using a metal drink bottle (camping style) with a hold drilled in the side…
…But got a little one off of eBay the other day so will be blinged up soon
I even sprayed it silver and the paint is now flaking off nicely
I’ll post a pic for you
In my defence I did it about 10 years ago when keeping it running was more of a financial challange - I may bend to pressure and get a proper one from DT’s
Hey, what, who ?
In the UK, they’re called IS Rayfast, www.israyfast.com, try this link to see some pictures of “heat shrinkable boots” - ISRayfast catalog pics
Pictures on my car - note I did a pretty sloppy job - looks ready to fall off, but its dried on there pretty solid…
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